Igniter plug

Abstract

An igniter plug that has the forward insulator 80 connected to the outer electrode 24 by a metal ring 60 which is brazed at 62 to the insulator 80 and welded at 61 to the outer electrode 24.

Having described the invention, what is claimed is: 
     
       1. In combination with an ignitor plug of the type having an inner elongated electrode having a front portion and a rear portion; an intermediate elongated insulator disposed around at least a portion of the electrode, said insulator having a front portion, a rear portion, and an axial passage extending through said insulator and having a portion of said electrode mounted therein; an outer elongated electrode comprising a metal shell mounted on the intermediate elongated insulator and disposed around the electrode and electrically isolated therefrom by the insulator, said metal shell having a rear portion and a front end portion which is arranged to provide a spark gap with the end of the front portion of said electrode; means for mounting a portion of the inner electrode within the elongated insulator; means for providing a pressure tight seal between said inner electrode, said elongated insulator and said metal shell; a forward insulator electrically isolating said forward portion of said outer shell from the forward portion of said electrode and being separated by an air space from said inner electrode; means for mounting said forward insulator to said outer shell, the improvement wherein said last mounting means comprises: a metal ring welded to said outer shell and brazed to the forward insulator.